<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Mail Templates Accessory</title>
</head>
<body>
<h3><span th:text="${username}"></span>，你好！</h3>
<p>这是一封HTML格式的邮件。请收下附件！</p>
</body>
</html>